Process and apparatus for producing a glazing equipped with a peripheral frame based on polymer

ABSTRACT

The invention describes a glazing equipped with an extracted profile on which or in place of which is cast a complement, which is connected to the profile. The procedure makes it possible to replace part of the profile which is difficult to produce by extrusion or to add to it foreign elements such as fastenings or various accessories.

FIELD OF THE INVENTION

The invention relates to a process for the production of a glazingprovided on its periphery with a frame or a frame portion based on apolymer and essentially obtained by the extrusion of a profile with theaid of a nozzle or die calibrated directly to the periphery of theglazing, deposition taking place either directly on the glass, or on anopaque layer bonded to the glass, optionally also accompanied by theinterposing of a primer. The invention also relates to the apparatus forperforming the process.

BACKGROUND OF THE INVENTION

U.S. Pat. No. 5,057,265 describes a process of the aforementioned typefor the production of a car glazing equipped with a profiled frame. Thisknown process uses a calibrated extrusion nozzle, which is positioned onthe edge of the glazing and then moved all along the perimeter, where itdistributes the polymer. When the nozzle has returned to its startingpoint after covering the entire perimeter of the glazing in order todeposit the profile there, the supply of the polymer is interrupted andthe nozzle moved away from the glazing. This method makes it possible todeposit a frame on the periphery of the glazing and in particular aframe having a lip extending towards the exterior. For this purpose itis merely necessary to use a polymer, whose high viscosity enables theprofile to remain in place after depositing it.

In the process described hereinbefore the finishing of the frame, i.e.the connection area between the start and finish of the extrusion isperformed in a second phase after the tool has been moved away from theglass, by using an appropriate shaping device which lays on the part inquestion in order to give it its final shape. Numerous differentpolymers have proved usable for this process, but normally use is madeof a one-component polyurethane, which polymerizes in atmospherichumidity. It is also possible to use two-component polyurethanes.

At the end of pressing with the special tool as described in U.S. Pat.No. 5,057,265 it is found that in the connection zone between the startand finish of the extruded joint, excess material is left behind on thejoint lip, which is necessary to cut after polymerizing the joint. Thisis a supplementary operation, which makes it necessary to handle theglazing again at the end of polymerization. Moreover, when the polymerquantity is not in excess in the manner described above, but is insteadin a slight deficit, the situation may be that a material deficiency isnoted more particularly on the generally thin lip which, in the case ofa car glazing, can be prejudicial to its subsequent operation when theglazing is fitted in the car.

The extrusion procedure involving the in situ extrusion of a joint onthe periphery of a glazing has numerous advantages. Particularly due toits flexibility, the in situ extrusion avoids the costs of veryexpensive moulds as are required in the encapsulation method known asreaction injection moulding (RIM). However, although profile variationsare compatible with the in situ extrusion method (cf. e.g. U.S. Pat. No.5,108,526 or EP-A-479,677), certain complicated shapes cannot bedirectly produced and in particular those extending beyond the peripheryof the glazing. This is particularly the case when it is wished toincorporate other functions into the joint, because they often occupy asignificant amount of space.

EP-A-255,218 describes a car glazing encapsulating RIM method, in whichduring the injection of the joint, various devices are incorporatedwhich are used for functions other than those conventionally exercisedby car glazing joints. These are, for example, in the form of a spoiler,a driving mirror, a stop light, electrical conductors, or are intendedfor the distribution of water, air, etc. The RIM method used involves asingle stage, the accessories being placed alongside the glazing in themould before the start of injection and are automatically inserted inthe joint of the finished glazing. The problem of inserting accessoriesin the vicinity of a profile extruded in the periphery of a glazing isvery different and it is impossible, particularly due to the cost ornature of the polymer, to think if using the RIM encapsulation method.

SUMMARY OF THE PRESENT INVENTION

The present invention aims at improving the glazing equipped with an insitu extruded profile by completing or supplementing said profile by acomplement and improving the aforementioned peripheral extrusion processin such a way as to obtain a joint having any shape in certain areas ofthe extruded peripheral joint. It also aims at making it possible toobtain a joint having a regular profile, even in areas where extrusioncannot take place correctly, such as e.g. in connection areas betweenthe start and the finish of the in situ extruded, peripheral profile.

The invention relates to a glazing, particularly a car glazing forbonding in the opening of a car body, which is equipped with an in situextruded, peripheral profile having a polymer part completing orreplacing the profile, whose shape it adopts at its junction therewith.The added part is either located in the transition area between thestart and finish of the frame extruded on the glazing or in the cornersof the glazing with acute angles or small radii. It also relates to carglazings having incorporated into the added part one or more of thedevices selected in the group consisting of stop lights, electric powersupplies such as for the heating of the glazing, antenna supply means,ducts for water or air, passages for windshield wiper shafts andfastenings.

According to the invention, a profile obtained by in situ extrusion of apolymer on the periphery of a glazing, optionally coated with an opaquelayer, is provided with a complement having a clearly defined shape andconnecting on either side of the profile. This is accomplished byplacing a mould member that rests on the glazing and connecting it tothe profile and by injecting into it a hardenable material, whichadheres at least to the polymer. Before putting into place the mouldmember, it is possible to remove all or part of the polymer at thelocation of the projection. The polymer is removed after complete orpartial hardening. Preferably, during the removal of the polymer at thelocation of the complement, a portion of the profile is left in place incontact with the glass or the opaque layer. The glazing according to theinvention is intended to preferably equip a car opening and the profileparticipates in the installation of the glazing by bonding. In thiscase, the complement can include one or more foreign elements which areintended to provide a function other than that of the actual profile.

The polymer used for the in situ extrusion is a one-componentpolyurethane polymerizing with atmospheric humidity, or alternatively atwo-component polyurethane. The hardenable material is preferably basedon a one-component polyurethane, which is transformed into an elastomerunder the action of heat.

The invention also relates to an apparatus having a two-part mouldmember with a cavity, whose shape corresponds to the shape desired forthe complement and which is connected to the surface of the glazing andon either side of the complement to the extruded profile with aninjection orifice linked with the cavity. Moreover, the upper and lowerparts are provided with heating or cooling means. Preferably, the cavityis limited or bounded by sealing slats emerging from the surface of themould, the sealing slats bearing on the glazing surface being mobile andoperated by a spring.

Moreover, in the lower part of the mould member, the limit of the end ofthe lip of the profile is constituted by the end of a sliding platesliding on the planar surface of the lower part. Advantageously, thesliding plate is equipped with jaws, which cooperate with a jackpositioning the sliding plate in a position close to the lip. If it is aquestion of repairing the extruded profile after ablation in the cornerarea, the lower part of the mould member is preferably equipped with aplate cut with a contour limiting the corner of the lip, while thelimits of the end of the lip on either side of the contour areconstituted by the ends of sliding plates sliding on the planar surfaceof the lower part and which can bear on the one hand on the edge of thelip and on the other on the bearing surfaces of the cut plate.

The inventive procedure described hereinbefore has two differentfunctions. On the one hand, it makes it possible to correct areas wherethe extruded profile is badly shaped, such as, for example, theconnection area between the start and finish of the peripheral profile.It also makes it possible to add to a profile having a correct shape apart adding other characteristics thereto.

With regards to the method for correcting a defective profile, theinvention makes it possible to act when the profile has alreadyhardened. Therefore, the method is much less difficult than theconventional methods consisting of modelling the still soft profile witha risk of deforming adjacent areas having a satisfactory shape. Inaddition, on using a polymer which hardens relatively rapidly within themould, there is a combination of the advantage of a very shortproduction phase and the absence of any subsequent deformation of thepart once it has been removed from the mould.

As far as the question of repairing the connection between the start andfinish of a peripheral profile extruded in situ on the glazing isconcerned, it is advantageous to cut the defective part followingcomplete hardening, which leads to very clean cuts. However, forproduction reasons, it may be of interest to remove the defective areaimmediately following its deposition, i.e. before polymerization. Acombination of the two methods is also possible, i.e. removal of most ofthe material when it is still pasty and cutting burrs afterpolymerization.

Both for the repairs to a defective profile and for creating acompletely new complement or part, it is indispensable that the materialused must be able to ensure a very good, durable adhesion to theremainder of the extruded profile. Therefore, preference is given to theuse of polymer systems having the same chemical base, but which havedifferent hardening conditions to the polymer forming the extrudedprofile.

It is also possible that the nature of the polymer which has beenmoulded over the extruded profile is such that there is a good adhesionto the polymer constituting the joint, but problems in connection withthe adhesion to the glass or enamel of the substrate. In this case, itmay be advantageous to not completely remove the old profile, but leavea layer having a certain thickness in contact with the glass or enamelon which the moulded material can easily adhere.

In the case where the projection is to ensure a wider contact with theglass than that of the original profile, it may be necessary to carryout a special priming of the new glass or enamel surface intended to bein contact with the moulded material.

The materials compatible with the process according to the invention arein general all polymer systems provided for injection, to the extentthat they ensure an adequate adhesion to the extruded profile already inplace and possibly with the glass or enamel which they cover.

It is also advantageous that the polymers used have a very short settingtime. Thus, for example, two-component polyurethane adhesives, hotmelts, polymers for forming the cast or moulder layers, or thermoplasticpolymers of different types may prove suitable. It is also importantthat the polymers adopted also have, in addition to the aforementionedproperties, the same hardness, elasticity and appearance as adjacent insitu extruded profile portions. Thus, in the finished product it must inall cases be impossible or at least difficult to distinguish thetransition between the extruded part and the subsequently moulded part.

When the profiled frame deposited by extrusion on the glazing isconstituted by a one-component polyurethane system, which polymerizesunder the influence of moisture, such as e.g. that described in U.S.Pat. No. 3,779,794, a composition which has proved suitable for thecasting of an added part on the preceding profile is based on areactive, one-component polyurethane system, which polymerizes byhardening under the action of heat. Such a material is commerciallyavailable under the reference SIKAFLEX 360 HC.

Hitherto, it was believed that a material of this type was only able topolymerize in a furnace with a flow of hot air and infrared heating withmiddle wavelength. It was therefore considered necessary for the surfaceof the material to be exposed to the atmosphere. During the tests whichled to the invention, it has been found that polymerization can takeplace in a heated mould. It appears even that the hardening of thematerial in contact with the mould takes place particularly rapidly.From the performance standpoint, it is of interest to inject thematerial into an already preheated mould, because in this way at thestart of the injection procedure the material has a viscosity whichdecreases enabling it to penetrate into the smallest unevennesses of themould. This gives a moulded part having neither bubbles, nordeficiencies in remote areas.

At the end of the filling of the mould cavity, the heat-based polymerhardening process starts immediately. With a mould temperature of, forexample, 140° C., the elastomer completely sets after one minute and atthis moment the mould can be removed from the glazing.

The process according to the invention is not only usable forreconstituting the connection area between the start and finish of theprofile desired on the periphery of a glazing, but also for any othercorrection at any point of the profile. Whenever the direct in situextrusion causes a problem and the quality at a given location is notexcellent, it is possible to start again by the above-described processto make the profile at such location.

Thus, for example, when a glazing equipped with a frame or frame portionhas in one of its angles a pointed corner, where it is difficult toextrude a profile with a constant section, it is very easy to stopextrusion in said corner, or if it has already been produced to removethe profile after hardening, and to complete or repair it by casting theprofile part.

In this way it is possible to obtain shapes, which could not be obtainedby direct extrusion.

In the same way the added part obtained by casting can include foreignelements, which will thus be definitively fixed to the periphery of theglazing. These can be fitting elements such as shims, screws, hooks,etc. These elements are then used either for the fixing of the glazingin an opening, for example, of a car, or for fixing other objects suchas, for example, a driving mirror or the support for an officialrosette. However, the procedure according to the invention also makes itpossible to directly integrate accessories on the periphery of theglazing. These will, for example, consist of signals, such as stoplights, electric power supplies such as for the heating of the glazing,antenna supplies, water or air ducts, passages for windshield wipershafts, etc.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the connection area between the startand finish of an extruded profile such as is obtained from an extrusionprocess;

FIG. 2 is a perspective view of the same area of the glazing as in FIG.1 after removing the profile;

FIG. 3 is a perspective view of a mould for casting the transition areaprofile part;

FIG. 4 is a section along line IV--IV in FIG. 3;

FIG. 5 is a section along line V--V in FIG. 3;

FIG. 6 is a section of a variant of a detail of FIG. 4;

FIG. 7 is a perspective view of a variant of the mould for casting arectilinear profile;

FIG. 8 is a perspective view of a mould for producing a corner profile,showing the lower part of the mould;

FIG. 9 is a detail of the upper part of the mould of FIG. 8;

FIG. 10 is a perspective view of two parts of a mould for bringing aboutthe grafting of the joint to the corner of a glazing; and

FIG. 11 is a perspective view of the glazing equipped with its modifiedjoint.

DETAILED DESCRIPTION OF THE INVENTION

In most of the drawings it is possible to see the edge of a glass plate1 on the periphery of which has been extruded a profile 2. The glazing 1is shown in the form of a monolithic plate. It is obvious that it couldbe both an insulating glazing constituted by unitary plates separated byan air space or a space for some other gas, or a laminated glazing likethose used for producing car windshields.

Such glazings intended for use in cars are usually peripherally providedwith an opaque enamel deposit in the form of a frame 3. The mainfunction of this enamel is to protect the profile 2 against the actionof ultraviolet rays, but it also makes it possible to hide all parts ofthe windshield fitting system. In the embodiments adopted, the profile 2has a substantially U-shaped cross-section with a flat bottom 4 and tworibs for limiting the expansion of the adhesive at the time ofinstallation, namely internal rib 5 and external rib 6. The external rib6 is extended at right angles beyond the edge of the glazing 1 by a lip8 substantially parallel to the glazing. During installation the saidlip 8 bends and protects the edge of the glass at the time when theglazing is inserted in the car body opening. At the end of insertion theprofile in the form of the lip 8 is used for cantering the glazing inthe opening. In the finished car, said lip 8 connected to the body hasan aesthetic function in that it masks the groove remaining between theglazing and the body.

The profile 2 is obtained by direct in situ extrusion on the peripheryof the glazing 1. Extrusion takes place directly on the glass or on thelayer 3, optionally following the interposing of one or more layers ofan adhesion primer.

Such a process is, for example, described in U.S. Pat. No. 5,057,265. Inthe case where the profile 2 is deposited on the entire perimeter of theglazing 1, when the extrusion nozzle reaches the location where itstarted to make the deposit of the polymer on the glazing, it is raisedfrom the glass. At this location and as shown in FIG. 1, there is anexcrescence zone 10. In general, it is impossible to leave this zone inthe state which it is in, particularly because the lip 8 is so deformedthat it can no longer fulfill its function.

Means for improving the state of the excrescence zone when the polymeris still plastic have been described elsewhere. What is described hererelates to a procedure following the hardening of the polymer. When thepolymer has hardened sufficiently to enable the separation of the areain question without definitively deforming adjacent areas, the area inquestion is cut, which takes place in two phases. Firstly, the area orzone in question is separated from the remainder of the profile bymaking with a cutter two cutting lines S. In the second phase the entiredeformed area is cut by a line substantially parallel to the glasssurface. It is preferable for the second phase cut to take place at acertain distance from the glass, so as to leave on the surface a thinfilm of the old polymer, which will enable the new material to adhere tothe profile-glass assembly.

The preceding operation can take place on the completely hardenedpolymer using tools such as planning devices, milling cutters, etc. Theadvantage of using a milling cutter is that the operation can take placeautomatically after the glazing has been positioned on a support 13shown in FIG. 1.

In the case where casting is carried out by using a polymer having agood adhesion to the glass or the enamel layer covering it, it ispossible to either completely remove the polymer from the profile 2 downto the glazing surface, not to cover the area, i.e., to stop extrusionbefore reaching the area of the connection.

After the glazing has been prepared in the aforementioned manner, amould is deposited at the point in question and will be filled with anappropriate material for carrying out casting.

The mould shown in detail in FIGS. 3 and 5 is in two parts, namely anupper part 16 and a lower part 17. The separation zone 18 between thetwo is at the level of the lip 8. The upper part 16 and the lower part17 of the mould are both fixed to appropriate supports 19, 20. As aresult of mechanisms (not shown) these supports make it possible toplace the two halves of the mould on the edge of the glazing at thedesired time and then remove them at the end of the operation. The twomould halves are positioned precisely with respect to one another bymeans of centering lugs 21 and corresponding holes on the otherhalf-mould.

The lower half-mould 17 has a setback area 22 for receiving the glazing1 continued by the support 23 of the lip 8 up to the separation zone 18.The upper half-mould 16 has a cavity 24, whose surface 25 corresponds tothe upper part of the profile 2. Like the setback area 22, the cavity 24extends into the lower half-mound 17 over the entire mould length, i.e.,it issues to the outside. In this way, the profile 2, in the same way asthe surface of the glazing, constitutes the limit of the mould.

In order to compensate for any tolerances on the profile 2 and/orthickness tolerances on the glazing, the upper part of the mould 16 hasa simple longitudinal sealing slat 26 and a pair of perpendicularsealing slats 27 on its surface 25. The sealing slats 27 extendperpendicular to the length of the profile over the entire width of thesurface 25 and are located in the cavity in such a way that they bear onthe complete ends of the profile 2. Thus, they ensure a very goodsealing at the limit of the cavity. Thus, they elastically deform theprofile 2 which, as a result of a spring effect, ensures the necessarysealing. The longitudinal sealing slat 26 fulfills the same function inthe other direction at the limit of the glass surface. It is positionedprecisely at the limit of the lower layer 12, which is all that remainsof the old profile and it directly presses on the glass or on the layer3, if the latter is present.

The two halves of the mould 16, 17 are equipped with means enabling themto be heated in a controlled manner up to the chosen temperatures. Theycan, for example, be equipped with electrical resistors or thermometerprobes, but it is also possible to use a heat transfer liquid. In thiscase, the two mould halves 16, 17 are provided with openings 30, towhich are connected the pipes 31, 32 to enable the hot oil to circulate.A heating device is necessary in the case where the material used forthe casting is a one-component polyurethane, which polymerizes withheat.

The upper mould 16 is provided with an injection hole 35, which widensat 36. When the upper half-mould 16 and lower half-mould 17 have beenplaced correctly on the edge of the glass, an injection nozzle is placedin the hole 36 and the mould cavity is filled with liquid polymer. It isimportant that immediately after the filling the injection nozzle ismoved away from the mould to protect it against heat and thereforeprevent hardening of the polymer within the nozzle. The two mould halves16,17 remain in place for a sufficient time to ensure that under theaction of the heat the polymer has hardened and until there is no longerany possibility of a deformation of the new moulded part.

FIG. 6 shows a modified embodiment of an element of the upper half-mould16. Its purpose is to replace the longitudinal sealing slat 26, which isnormally fixed with a mobile slat 40. The slat 40 makes it possible tocompensate glazing thickness tolerances. It is placed between the wallof the half-mould 16 and a fixing plate 42, which is itself fixed to themould by a screw 45. The slat 40 can move vertically and bears on theglass as a result of the action of the spring 41. However, its movementis limited by the lug 43, which is placed in the recess 44, which inparticular limits its downward displacement when the upper half-mould isseparated from the glass.

It is obvious that, if necessary, the surfaces of the mould cavities canbe provided with layers preventing the adhesion of the material to becast and facilitating removal of the mould. Moreover, the surfaces ofthe cavities can be treated in different ways to give them a structuremaking it possible to precisely obtain the same surface appearance asthat of the profile obtained by extrusion. This can consist ofpolishing, chemical etching, sandblasting, etc.

During the performance of the process according to the invention, atreatment with polytetrafluorethylene (PTFE) gives a good surfaceappearance and also permits easy removal of the mould.

Depending on the nature of the polymer used for the casting, it may benecessary to treat the surface both of the profile 2 and of the glass oreven the enamel layer with a suitable primer. Instead of using upper andlower half-moulds in one piece, in the manner described above, it isalso possible to equip the moulds with their own temperature regulating,positioning and other systems having various different shapes andadapted to the shapes of the profiles which it is wished to produce andwhich can be very rapidly changed.

The apparatus described above can also be used for a thermoplasticpolymer. In this case, the openings 30 of the two half-moulds 16, 17 areused for bringing about the circulation of a cooling liquid instead of aheating liquid. Thus, it is possible to obtain a rapid setting of thethermoplastic.

In certain cases, it may be of interest to provide the mould withcomplementary devices, like those shown in FIG. 7. More particularly inthe car industry, as a function of the particular car type, it oftenoccurs that the length of the lip 8 is not the same for the differentglazings equipping a car. Conversely, the other parts of the profile 2are generally identical. It can therefore be of interest to be able toadjust the length of the lip 8 as a function of the glazing which it iswished to treat.

Another reason which can make necessary the regulation of the positionof the end of the lip 8 is the production tolerances in connection withthe extruded joint. The apparatus according to FIG. 7 must on alloccasions allow a good transition with the existing joint.

Here again the contour of the half-mould 47 follows the lower edge ofthe glazing, the side of the glazing and the lower part of the lip 8,49. This part is extended by a planar surface 50 on which can slide asliding plate 51. The thickness of the plate 51 corresponds to thethickness of the lip 8 in its terminal portion. The front end 52 of thesliding plate 51 constitutes the limit of the mould corresponding to theedge of the lip 8. The upper half-mould 53 corresponds exactly to whathas been described up to now and it rests by its planar surface 54 onthe upper portion of the sliding plate 51.

To the exterior of the mould, the sliding plate 51 is held in jaws 57,58. The lower jaw 57 slides on the surface 59 of the lower half-mould 47and is terminated by a fork-shaped member 60. The fork 60 makes itpossible to keep in place the assembly of the jaws and the sliding plate51 due to a washer 61 controlled by the rod 62 of the jack 63.

The apparatus is operated in the following way. Firstly the lowerhalf-mould 47 is put into place. For this purpose the surface 48 isengaged on the lower face of the glazing and the vertical bearingsurface is placed on the edge of the glass. As the jack 63 is free,either manually, or automatically, the sliding plate 51 is brought intocontact with the edge of the lip 8 on either side of the area to betreated. The sliding plate 51 moves in the two directions of the plane.The following operation consists of acting on the jack 63, so as to fixthe position of the sliding plate 51 relative to the lower portion ofthe mould 47. The upper portion 53 of the mould is then preciselypositioned with reference to the lower part 47. The mould is now closedand injection can take place through the injection hole 35.

The principle of the inventive process described above in connectionwith FIG. 7 for part of the rectilinear profiles is also usable in theangles. This is often necessary, because it is impossible to deal withvery tight corners with extrusion nozzles and it is consequentlyimpossible to follow a sharp edge of the glazing. Moreover, in thoseparts of the glazing with very small radii of curvature, the peripherallip is very difficult to obtain by extrusion. Thus, it is necessary tovery accurately dose the respective quantities injected into theinterior and the exterior of the curve and often a scallop-shaped lip 8is obtained. Therefore, in this case, it is necessary to completelyregenerate the joint in the corner. For this purpose, and as shown inFIG. 8, use is made of a lower half-mould 70 and an upper half-mould 71,which are in each case adapted to the corner of the glazing 72. In thiscase the profiles 65 and 66 have been retained in their rectilinearportions and the curved portion of the corner has been cut in accordancewith the lines 73 and 74.

On the lower half-mould 70 at the lower limit of the lip 66, two planarsliding surfaces 75, 76 are provided. On the surface 75 a sliding plate77 is disposed and on the surface 76 a sliding plate 78. Both plates canslide on their respective surfaces. The edges 79, 80 of the plates 77,78, respectively, again form the limits of the lip 66.

The actual corner area of the lip 66 is limited by means of a fixedplate located at the same height as the sliding plates 77, 78. The cutplate 82 has a contour 85 limiting the corner of the lip 66 and hasbearing surfaces 83, 84. As in the preceding embodiment, the slidingplates 77, 78 move in the two directions of the plane. They cantherefore bear at one of their ends on the edge of the lip 66 and at theother end on one of the two bearing surfaces 83, 84, thus ensuring thecontinuity of the edge of the lip 66. The fixing of the sliding plates77, 78 following their precise positioning takes place in the same wayas in FIG. 7 by means of jacks, which engage the jaws on the lowerportion of the mould.

FIG. 9 shows the upper portion of the corner mould for assembly with thelower portion described above. The upper portion also has an injectionorifice 35.

FIG. 10 shows a variant of the invention, where an added part is cast onan extruded profile which has remained in place. This procedure is ofparticular interest in two cases: firstly, when it is necessary to givethe joint at certain locations, particularly the corners, a shape whichis very difficult or impossible to obtain by extrusion only and,secondly, when it is wished to add to the glazing new functions by meansof an elastomer complement, which is grafted on the extruded joint atthe periphery of the glazing. It is, for example, a question ofintegrating an electrical connector for the heating of the rear windowor windshield of a car, or the complement serves to receive thewindshield wiper spindle for the rear window.

FIG. 10 illustrates a case which is very difficult to bring about by themere in situ extrusion of the peripheral joint. The right angle of aglazing, when it is wished that the lip ensuring the centering of theglazing and which has a very important aesthetic function by masking thespace left between the glazing and the periphery of the opening alsoforms an angle of exactly 90°. It is a second method, which is differentand simpler than that illustrated by FIG. 8. Thus, there is no ablationof the joint in the area in question and the new complement is merelygrafted on the joint as it is.

FIG. 10 shows the glazing 1 with its edge 7 and the extruded joint 2with its lip 8. The glazing 1 has at 90 a 90° angle with a very smallradius of curvature. The joint 2 has been deposited without using aregulatable supply nozzle such as is e.g. described in U.S. Pat. No.5,108,526. Thus, in the glazing area, if the interior of the curve hasbeen correctly supplied, material is missing on the outer part on thelip 91. In order to cast this deficient joint, use is made of thespecial mould shown in the drawing. The lower half-mould 92 has a flatrecess 93 bounded by an angle iron 94. In the corner of the latter ahole 95 prevents tolerance problems from disturbing the positioning ofthe glazing edge 7 as it bears on the angle iron 94.

The upper portion of the lower half-mould 92 is provided with a mouldbottom plate 96 following the lower portion of the joint and whichtherefore covers the corner of the glazing when referenced on the angleiron.

The upper half-mould 97 adopts the shape of the upper portion of thejoint 2, namely where it is rectilinear. This also applies with respectto the interior 98 of the curve part of the joint 2, but on theexterior, the cavity 99 of the upper portion 97 of the mould has theshape which it is wished to give to the complement. It is in this zonewhere the injection orifice 100 is located.

The apparatus described above makes it possible to produce the glazingjoint shown in FIG. 11, where the extruded portions are shown white andthe complement, joined by casting, in grey with a right-angled lip 101and a reinforcing part 102 following the central rib of the profile 2.

The "grafting" procedure described above can have the same regulating,adjusting, heating or cooling system as described in connection withFIGS. 3 to 9.

We claim:
 1. In a glazing to be bonded into an opening of a car body,said glazing having an in situ extruded, peripheral profile, theimprovement wherein:a) said glazing includes at least one additionalpolymer component to complete or replace at least a portion of theextruded profile.
 2. In a glazing to be bonded into an opening of a carbody, said glazing having an in situ extruded peripheral profile, theimprovement wherein:a) at least one additional moulded polymer componentcontacts the extruded profile at at least one terminal junction portion.3. The glazing according to claim 2, wherein:a) at least a portion ofthe polymer component adopts the shape of the extruded profile at, saidterminal junction portions.
 4. The glazing according to claim 3,wherein:a) the extruded profile is extruded along the periphery of theglazing from a first terminal junction portion to a second terminaljunction portion; and b) the polymer component is joined to the extrudedprofile at said first terminal junction portion and said second terminaljunction portion.
 5. The glazing according to claim 3, wherein:a) theglazing includes at least one corner section along its periphery; and b)the polymer component is located at said corner section of the glazingbetween said terminal portions.
 6. The glazing according to any one ofthe preceding claims, wherein:a) the polymer part integrates one or moreof the devices selected from the group consisting of stop lights,electric power supplies such as for heating the glazing, antenna powersupplies, water or air ducts, passages for windshield wiper shafts andfastenings.